Evaluate
-\left(x+7\right)\left(5x+7\right)
Expand
-5x^{2}-42x-49
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4x^{2}-\left(49+42x+9x^{2}\right)
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(7+3x\right)^{2}.
4x^{2}-49-42x-9x^{2}
To find the opposite of 49+42x+9x^{2}, find the opposite of each term.
-5x^{2}-49-42x
Combine 4x^{2} and -9x^{2} to get -5x^{2}.
4x^{2}-\left(49+42x+9x^{2}\right)
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(7+3x\right)^{2}.
4x^{2}-49-42x-9x^{2}
To find the opposite of 49+42x+9x^{2}, find the opposite of each term.
-5x^{2}-49-42x
Combine 4x^{2} and -9x^{2} to get -5x^{2}.
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